What's the good topic of keeping a diary?

A touching thing: the trouble of growing a landscape, the trouble of studying and the trouble of a harmonious society. My ideal, success, failure, happy day, happy day, painful day, disappointed day ... the breath of spring, beautiful Guilin, hometown, campus, capital ... travel notes, a day trip to XX Park and Science and Technology Museum and other classes, streets, buildings, campus clubs, first fishing, rock climbing and other interesting things. Speech ... I learned _ _ _ _ _ _ to be strong, brave, grateful, persistent, give up, optimistic, enjoy life, find the beauty in life, face failures and setbacks, and be in trouble ... I have some feelings when reading XX, such as If I have a bright day, Jane Eyre, Count Kido: Camel Xiangzi, Complete Works of Lu Xun and Old Things in the South of the City. Four classic novels and historical records watch XX movies and feel the touching scene of Ward Diary. Please use your conscience to answer an unforgettable sports meeting, the most thrilling and successful attempt in winter vacation, something you don't want to mention. Tomb-Sweeping Day.